Over the years the image of the clock has been abstracted and stylized to a point where a long and a short line inside a circle, or even inside four dots on the ordinals, can be instantaneously recognized as a clock. This is perfectly fine if you already know how to read the analog clock but it makes no sense to use such a design as a teaching aid.
As a teaching device, you need to make sure all the information that has been abstracted away has been put back.
That is the basic principle of the ccClock
Uploaded by HackerPublicRadio on